Liquid injection device for square aluminum shell battery cell

Abstract

The utility model provides a liquid injection device for a square aluminum shell battery cell, which relates to the technical field of lithium batteries and comprises a negative pressure component, an electrolyte container and a liquid injection needle component, the liquid injection needle assembly comprises a liquid injection needle body, an upper limiting piece and a lower limiting piece are arranged on the liquid injection needle body, a pressure spring and a rubber sealing cover are arranged between the upper limiting piece and the lower limiting piece, and the liquid injection needle body is sleeved with the pressure spring and the rubber sealing cover. The utility model provides a liquid injection device for a square aluminum shell battery cell. A negative pressure assembly and an electrolyte container are connected with a liquid injection needle assembly through a three-way valve; the negative pressure assembly extracts air in the battery cell, so that the interior of the battery cell is in a negative pressure state; and the electrolyte in the electrolyte container enters the battery cell, so that the injection of the electrolyte is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a square aluminum shell battery core liquid injection device. Background Art

[0002] In existing battery cell filling technology, the cell filling device integrates highly coordinated components, such as a slide cylinder, a reversing valve, a precision injection needle, an efficient vacuum pump, a stable filling pump, and negative pressure return and cleaning equipment for subsequent processing. This series of sophisticated components work together to ensure the smooth and high-quality completion of the cell filling process.

[0003] The injection process is rigorous and meticulous. First, the injection needle is precisely inserted into the battery cell to ensure the correct injection path. Next, a vacuum pump is connected to the negative pressure device to effectively remove the air from the battery cell, creating an ideal oxygen-free and dust-free environment for electrolyte injection. Next, an injection pump is used to smoothly inject the predetermined volume of electrolyte into the battery cell. The key to this step lies in precise control of the injection volume to ensure stable and optimal battery performance.

[0004] After injection is complete, the injection needle is temporarily connected to the atmosphere to achieve a smooth pressure transition, then slowly leaves the battery cell, avoiding possible electrolyte splashing or bubble formation caused by rapid movement. Immediately afterwards, the return negative pressure device begins to operate, effectively extracting the residual electrolyte in the injection needle, preventing electrolyte waste and potential impact on subsequent operations.

[0005] During the entire injection process, multiple key parameters must be precisely set, such as the predetermined pressure range for vacuuming, the predetermined pressure holding time to ensure the stability of the internal environment of the battery cell, the air-breaking time to achieve a safe pressure transition, the liquid return time to optimize the liquid return efficiency, the liquid injection time to control the liquid injection speed and stability, and the cleaning time to ensure the cleanliness of the equipment and preparation for the next use. Utility Model Content

[0006] The purpose of the utility model is to provide a square aluminum shell battery cell liquid injection device to alleviate the technical problems of the prior art battery cell liquid injection device, such as cumbersome operation, the need to set multiple parameters, and the bulky and inconvenient portability.

[0007] The utility model provides a square aluminum shell battery cell injection device, comprising a negative pressure component, an electrolyte container and an injection needle component; the negative pressure component is provided with a first connecting tube, the electrolyte container is provided with a second connecting tube, and the injection needle component is provided with a third connecting tube;

[0008] A three-way valve is provided at one end of the first connecting pipe away from the negative pressure assembly, and the second connecting pipe and the third connecting pipe are both connected to the three-way valve;

[0009] The injection needle assembly includes an injection needle body, an upper limit piece and a lower limit piece are provided on the injection needle body, a pressure spring and a rubber sealing cover are provided between the upper limit piece and the lower limit piece, and the pressure spring and the rubber sealing cover are both sleeved on the injection needle body.

[0010] In an optional embodiment, the negative pressure assembly includes a negative pressure body, the first connecting pipe is provided on the negative pressure body, and the first shut-off valve is provided on the first connecting pipe.

[0011] In an optional embodiment, the negative pressure body is provided with a first pipe opening and a first rubber cap, and the first rubber cap is used to seal the first pipe opening.

[0012] In an optional embodiment, a second shut-off valve is provided on the electrolyte container, and the second shut-off valve is used to control whether the electrolyte in the electrolyte container flows into the second connecting pipe.

[0013] In an optional embodiment, the upper limit member is an upper limit rod, which is symmetrically arranged on the injection needle body, and the length of the upper limit rod is greater than the outer diameter of the pressure spring.

[0014] In an optional embodiment, the upper end of the rubber sealing cover has a pressure plane, and the pressure spring abuts against the pressure plane.

[0015] In an optional embodiment, the lower limiting member is a lower limiting rod, and the lower limiting rod is symmetrically arranged on the injection needle body.

[0016] In an optional embodiment, the negative pressure body is a rubber ball.

[0017] The negative pressure component and electrolyte container of the square aluminum shell battery cell injection device provided by the utility model are connected to the injection needle component through a three-way valve; the negative pressure component extracts air from the battery cell, making the battery cell in a negative pressure state; the electrolyte in the electrolyte container enters the battery cell, thus completing the injection of the electrolyte.

[0018] The square aluminum case battery cell filling device significantly simplifies the filling process by optimizing the filling process, reducing the number of parameters required by the user, thereby significantly improving operational convenience. It also adopts a compact design, significantly reducing the size and weight of the square aluminum case battery cell filling device, making it lighter and more portable, and suitable for flexible use in different situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of the connection between the negative pressure assembly and the electrolyte container of the square aluminum shell battery cell injection device provided by an embodiment of the present utility model;

[0021] Figure 2 This is a structural schematic diagram of the injection needle assembly of the square aluminum shell battery cell injection device provided in an embodiment of the present utility model.

[0022] Icon: 100-negative pressure body; 200-electrolyte container; 300-first connecting pipe; 400-second connecting pipe; 500-three-way valve; 600-third connecting pipe; 700-first pipe mouth; 800-first rubber cap; 900-injection needle body; 110-upper limit member; 120-pressure spring; 130-rubber sealing cover; 140-lower limit member; 150-first stop valve; 160-second stop valve. DETAILED DESCRIPTION

[0023] The terms "first", "second", "third", etc. are only used to distinguish and describe, and do not indicate the order of arrangement, nor can they be understood as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0025] In the description of this application, it should be noted that the terms "inside", "outside", "left", "right", "up", "down", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0026] In the description of this application, unless otherwise clearly specified and limited, the terms "set", "install", "connected" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection between the internal parts of two elements.

[0027] The technical solution of this application will be clearly and completely described below with reference to the accompanying drawings.

[0028] Reference Figure 1-Figure 2 The present invention provides a square aluminum shell battery cell injection device, comprising a negative pressure assembly, an electrolyte container 200 and an injection needle assembly; the negative pressure assembly is provided with a first connecting tube 300, the electrolyte container 200 is provided with a second connecting tube 400, and the injection needle assembly is provided with a third connecting tube 600;

[0029] A three-way valve 500 is provided at one end of the first connecting pipe 300 away from the negative pressure assembly, and the second connecting pipe 400 and the third connecting pipe 600 are both connected to the three-way valve 500;

[0030] The injection needle assembly includes an injection needle body 900, on which an upper limit member 110 and a lower limit member 140 are arranged, and a pressure spring 120 and a rubber sealing cover 130 are arranged between the upper limit member 110 and the lower limit member 140, and the pressure spring 120 and the rubber sealing cover 130 are both mounted on the injection needle body 900.

[0031] In some embodiments, an injection groove is provided on the battery cell cover, and an injection positioning notch is provided in the injection groove; the injection needle body 900 can be inserted into the injection hole on the battery cell cover, and the lower limit member 140 on the injection needle body 900 can be assembled into the injection positioning notch on the battery cell cover, so that the injection needle body 900 will not rotate.

[0032] The gas in the battery cell is evacuated by using the negative pressure component, and then the electrolyte in the electrolyte container 200 can flow into the third connecting tube 600 along the second connecting tube 400 and then into the battery cell.

[0033] The square aluminum case battery cell filling device significantly simplifies the filling process by optimizing the filling process, reducing the number of parameters required by the user, thereby significantly improving operational convenience. It also adopts a compact design, significantly reducing the size and weight of the square aluminum case battery cell filling device, making it lighter and more portable, and suitable for flexible use in different situations.

[0034] In an optional embodiment, the negative pressure assembly includes a negative pressure body 100 , the first connecting pipe 300 is provided on the negative pressure body 100 , and the first shut-off valve 150 is provided on the first connecting pipe 300 .

[0035] In an optional embodiment, the negative pressure body 100 is provided with a first pipe opening 700 and a first rubber cap 800 , and the first rubber cap 800 is used to seal the first pipe opening 700 .

[0036] In some embodiments, the negative pressure body 100 of the negative pressure assembly is connected to the three-way valve 500 through the first connecting tube 300; when it is necessary to extract the air in the battery cell, the negative pressure body 100 is pressed to allow the air in the battery cell to flow into the negative pressure body 100, and then the air in the battery cell is evacuated; in this way, the electrolyte in the electrolyte container 200 can flow into the third connecting tube 600 through the second connecting tube 400, and then flow into the injection needle assembly, thereby injecting electrolyte into the battery cell.

[0037] In an optional embodiment, a second shut-off valve 160 is provided on the electrolyte container 200 , and the second shut-off valve 160 is used to control whether the electrolyte in the electrolyte container 200 flows into the second connecting pipe 400 .

[0038] When the negative pressure component is used to extract the air in the battery cell, the second stop valve 160 is in a closed state, and the electrolyte in the electrolyte container 200 cannot enter the second connecting tube 400; when the electrolyte needs to be introduced into the battery cell, the first stop valve 150 is closed and the second stop valve 160 is opened, and the electrolyte in the electrolyte container 200 enters the second connecting tube 400, and then flows from the second connecting tube 400 into the third connecting tube 600, so that it can enter the injection needle body 900 to realize the injection of the electrolyte.

[0039] Reference Figure 2 In an optional embodiment, the upper limit member 110 is an upper limit rod, which is symmetrically arranged on the injection needle body 900, and the length of the upper limit rod is greater than the outer diameter of the pressure spring 120.

[0040] In an optional embodiment, the upper end of the rubber sealing cover 130 has a pressure plane, and the pressure spring 120 abuts against the pressure plane.

[0041] In an optional embodiment, the lower limiting member 140 is a lower limiting rod, and the lower limiting rod is symmetrically arranged on the injection needle body 900.

[0042] In an optional embodiment, the negative pressure body 100 is a rubber ball.

[0043] An upper limit rod is provided on the injection needle body 900, and the length of the upper limit rod is greater than the pressure spring 120. One end of the pressure spring 120 abuts against the upper limit rod, so that the pressure spring 120 is supported by the upper limit rod, so that the pressure spring 120 has a tendency to move downward, and the other end of the pressure spring 120 abuts against the pressure plane of the rubber sealing cover 130, so that the rubber sealing cover 130 can be kept in the injection groove, playing the role of sealing the injection hole, and preventing other air from entering the battery cell from the injection hole when the negative pressure component extracts the air in the battery cell.

[0044] The negative pressure body 100 is generally a rubber ball. By repeatedly pressing the rubber ball, the gas in the battery cell is extracted. Generally, a scale is provided on the electrolyte container 200, and the amount of electrolyte added to the battery cell is calculated by the scale.

[0045] When the negative pressure body 100 is in a pressed state, the first pipe opening 700 is in an open state, and the second stop valve 160 and the first stop valve 150 are in a closed state; the first rubber cap 800 is covered on the first pipe opening 700 to seal the first pipe opening 700; the first stop valve 150 is opened, and the air in the battery cell enters the negative pressure body 100; the first stop valve 150 is closed, and the first rubber cap 800 is removed from the first pipe opening 700, thereby squeezing the negative pressure body 100 and squeezing the air out of the negative pressure body 100. Repeat the above operation to extract the air in the battery cell.

[0046] The negative pressure component and electrolyte container 200 of the square aluminum shell battery cell injection device provided by the present invention are connected to the injection needle component through a three-way valve 500; the negative pressure component extracts air from the battery cell, making the battery cell in a negative pressure state; the electrolyte in the electrolyte container 200 enters the battery cell, thus completing the injection of the electrolyte.

[0047] The square aluminum case battery cell filling device significantly simplifies the filling process by optimizing the filling process, reducing the number of parameters required by the user, thereby significantly improving operational convenience. It also adopts a compact design, significantly reducing the size and weight of the square aluminum case battery cell filling device, making it lighter and more portable, and suitable for flexible use in different situations.

[0048] The square aluminum-cased battery cell injection device boasts a sophisticated design and compact size, making it ideal for portable use and greatly enhancing its ease of use. Its simple and intuitive operation allows even first-time users to quickly master it without requiring extensive training. Importantly, the device's cost-effectiveness and availability of readily available materials reduce overall manufacturing costs, making it more affordable. Furthermore, its ability to quantitatively inject electrolyte ensures precise operation, a significant industry innovation.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A square aluminum shell battery cell injection device, characterized in that: It comprises a negative pressure component, an electrolyte container (200) and an injection needle component; the negative pressure component is provided with a first connecting tube (300), the electrolyte container (200) is provided with a second connecting tube (400), and the injection needle component is provided with a third connecting tube (600); A three-way valve (500) is provided at one end of the first connecting pipe (300) away from the negative pressure assembly, and the second connecting pipe (400) and the third connecting pipe (600) are both connected to the three-way valve (500); The injection needle assembly includes an injection needle body (900), an upper limit member (110) and a lower limit member (140) are provided on the injection needle body (900), a pressure spring (120) and a rubber sealing cover (130) are provided between the upper limit member (110) and the lower limit member (140), and the pressure spring (120) and the rubber sealing cover (130) are both sleeved on the injection needle body (900).

2. The square aluminum shell battery cell liquid injection device according to claim 1, characterized in that: The negative pressure assembly comprises a negative pressure body (100), the first connecting pipe (300) is provided on the negative pressure body (100), and the first shut-off valve (150) is provided on the first connecting pipe (300).

3. The square aluminum shell battery cell liquid injection device according to claim 2, characterized in that: The negative pressure body (100) is provided with a first pipe opening (700) and a first rubber cap (800), and the first rubber cap (800) is used to seal the first pipe opening (700).

4. The square aluminum shell battery cell liquid injection device according to claim 3, characterized in that: The electrolyte container (200) is provided with a second stop valve (160), and the second stop valve (160) is used to control whether the electrolyte in the electrolyte container (200) flows into the second connecting pipe (400).

5. The square aluminum shell battery cell liquid injection device according to claim 1, characterized in that: The upper limit member (110) is an upper limit rod, which is symmetrically arranged on the injection needle body (900), and the length of the upper limit rod is greater than the outer diameter of the pressure spring (120).

6. The square aluminum shell battery cell liquid injection device according to claim 5, characterized in that: The upper end of the rubber sealing cover (130) has a pressure plane, and the pressure spring (120) abuts against the pressure plane.

7. The square aluminum shell battery cell liquid injection device according to claim 6, characterized in that: The lower limiting member (140) is a lower limiting rod, and the lower limiting rod is symmetrically arranged on the injection needle body (900).

8. The square aluminum shell battery cell liquid injection device according to claim 2, characterized in that: The negative pressure body (100) is a rubber ball.

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